Support for rolled light-sensitive photographic material

Abstract

A support for rolled light-sensitive photographic materials is disclosed. The support is composed of at least three polyester films laminated, in which outer layers are comprised of copolyester; at least one interlayer is comprised of the mixture of said copolyester and homopolyester; the total film thickness is between 105 and 130 mupm; the total thickness of interlayers is between 45 and 85 mum; and the ratio of said copolyester in the mixture layer of said copolyester and said homopolyester is between 10 and 40 percent by weight.

Description

[0001] The present invention relates to a support for rolled light-sensitive photographic materials which can be used for 120 or 135 photographic films, which are widely employed as er halide photographic films for general purpose cameras.[0002] Generally, cited as representative examples of silver halide light-sensitive photographic materials (photographic film) are sheet films such as X-ray film, film for graphic arts, cut film, and roll film. Listed as representative roll film are color film and black-and-white film having a width of 35 mm or less, which are placed in velvet lined cartridges which are loaded in general purpose cameras and employed for general picture taking. In addition, 120 film, having a greater width, may be listed.[0003] Heretofore, cellulose triacetate film (TAC) has been used as the primary support for roll film. TAC film as the photographic support features excellent properties such as no optical anisotropy, high transparency, and residual curl diminishing...

AI Technical Summary

Benefits of technology

[0011] Namely, by adjusting film thickness from 105 to 130 .mu.m, provided are rolled light-sensitive photographic materials which can be employed in cameras designed for commonly used 120 and 135 film, without resulting in focusing problems; results in almost no problem of roll set curl tendency even at a film thickness of 105 to 130 .mu.m; exhibit excellent recovery properties from roll set curl as well as excellent adhesion between layers; and can be used in processors and the like without resulting in any problem.

[0082] Physical properties of the support of the present invention will now be described. In order to minimize conveyance problems in cameras as well as in processors and generation of abrasion marks due to conveyance problems, the polyester support employed in the present invention preferably exhibits the physical properties described below.

Problems solved by technology

Said organic solvents, especially chlorine based solvents such as methylene chloride and the like, which are used to dissolve cellulose triacetate, may cause environmental problems.

As a result, problems occur such as, for example, conveyance problems in the camera, generation of abrasion during the photographic processing as well as the printing process after said photographic processing, which is carried out to form images on a photographic paper, jamming during conveyance, and the like.

It has been discovered that when the technique described in said patent is simply applied to an approximately 120 .mu.m thick layer, the roll set curl tends to increase; recovery properties from the roll set curl is somewhat degraded compared to an 80 .mu.m thick layer; conveyance in processors is degraded, and adhesion between layers is insufficient.

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